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In perfusion experiments it was demonstrated that in close vicinity to the lower wall of a microscopic flow chamber a fraction of red blood cells do not exhibit the typical rotational motion, but flow in a steady position with the flat surface to the wall. The velocity of these cells is significantly smaller than that of the fluid in the same region of the channel. It is suggested that the phenomenon is caused by the action of adhesion-type forces operating between the flowing cells and the channel wall.